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CBSE Notes for Class 7 Science chapter 2. Nutrition in Animals: Nutrition, quick revision notes for Class 7 Science chapter 2. Nutrition in Animals Nutrition, Chapter-wise CBSE Revision Notes, CBSE Notes PDF Free Download, CBSE One Liner Notes Class 7, Half Yearly Revision Notes, CBSE Revision Notes Class 7 Science
Get CBSE Notes for Class 7 Science Chapter 2. Nutrition in Animals: Nutrition prepared by experts as per the latest NCERT syllabus and CBSE exam pattern. These concise and easy-to-understand notes cover important definitions, formulas, diagrams, and key concepts from the chapter to help students in quick revision and effective exam preparation. Whether you are studying for school tests, board exams, or competitive exams, these notes provide a reliable study resource. Designed in simple language with point-wise explanations, they save time and enhance learning efficiency. Download free PDF notes, explore solved examples, and strengthen your understanding of [Topic Name] for scoring high marks. Perfect for Class 7 students who want clear, structured, and exam-oriented notes for CBSE Science.
Milk Teeth : The first set of teeth grows during infancy and they fall off at the age between six to eight years. These are termed milk teeth.
Permanent Teeth : The second set that replaces milk teeth are called the permanent teeth.
Types of teeth :
(i) Molar : Molars are used for chewing and grinding.
(ii) Premolar : Premolars are used for chewing and grinding.
(iii) Canine : Canines are used for piercing and tearing.
(iv) Incisor : Incisors are used for bitting and cutting.
Ingestion : The process of taking food into the body is called ingestion.
Test for starch in food : We take two test tube named A and B. Take one teaspoonful of boiled rice in test tube A. In test tube B keep one teaspoonful of boiled rice after chewing. Add 3–4 mL of water in both the test tubes. Now pour 2–3 drops of iodine solution in each test tube and we observe that test tube turns it colour into blue of blackinsh. It show that the presence of starch in food.
Tooth decay : When we do not clean our teeth and mouth after eating,
many harmful bacteria also begin to live and grow in it. These bacteria break down the sugars present from the leftover food and release
acids. The acids gradually damage the teeth. This is called tooth decay.
Stomach : The stomach is a thick-walled bag. Its shape is like a flattened J and it is the widest part of the alimentary canal. It is a gland which secretes digestive juice.
Functions of Stomach :
(i) It receives food from the food pipe at one end and opens into the small intestine at the other.
(ii) The inner lining of the stomach secretes mucous, hydrochloric acid and digestive juices.
(iii) It also provides acidic medium to the food.
Mucous : Mucous is a watery substance secreted by inner lining of stomach.
Role of mucous in Stomach: The mucous protects the inner lining of the stomach.
Role of acids in Stomach :
(i) The acid kills many bacteria that enter along with the food.
(ii) It provides acidic medium in stomach.
(iii) The digestive juices rich in acids which break down the proteins into simpler substances.
The small intestine :
The small intestine is highly coiled and is about 7.5 metres long. It receives secretions from the liver and the pancreas. Besides, its wall also secretes juices.
Functions of small Intestine :
(i) It absorbs nutrients like fat, protiens, carbohydrates and some minerals.
(ii) Its wall also secretes juices.
Liver : The liver is a reddish brown gland situated in the upper part of the abdomen on the right side. It is the largest gland in the body.
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Ace your exams with CBSE Notes for Class 7 Science chapter 2. Nutrition in Animals: Nutrition. These notes provide a clear explanation of important concepts, formulas, diagrams, and solved examples from the NCERT syllabus. Specially designed for Class 7 students, the notes are structured in a simple, point-wise manner to make revision quick and effective. Whether you are preparing for school tests, board exams, or competitive exams, these Science notes will boost your confidence and save valuable study time. You can also download Science class 7 chapter 2. Nutrition in Animals free PDF notes for offline learning. With easy-to-grasp language, exam tips, and well-organized content, these CBSE Science notes on chapter 2. Nutrition in Animals – Nutrition are the perfect study companion for scoring high marks and mastering the subject.
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